The correct way to punctuate a sentence that states: "Of course it is none of my business, but -- " is to place a period after the word "but." Don't use excessive force in supplying such a moron with a period. Cutting his throat is only a momentary pleasure and is bound to get you talked about.

To get anywhere, or even to live a long time, a man has to guess, and guess right, over and over again, without enough data for a logical answer.

The second best thing about space travel is that the distances involved make war very difficult, usually impractical, and almost always unnecessary. This is probably a loss for most people, since war is our race's most popular diversion, one which gives purpose and color to dull and stupid lives. But it is a great boon to the intelligent man who fights only when he must-never for sport.

An armed man need not fight.

Revolution is an art that I pursue rather than a goal I expect to achieve. Nor is this a source of dismay; a lost cause can be as spiritually satisfying as a victory.

From the strictest humanitarian viewpoint, any attempt to stop the processes by which over crowded cities purge themselves is not a kindness.

Secrecy is the beginning of tyranny